Hi, I'm having this problem as well... There's so much information and variety in each text that I don't really understand how anyone could create a perfect essay on the spot, answering an unseen question in 40 mins!! So what I tend to do is write a draft essay with maybe 5 or 6 paragraphs (and then choose my most suitable 3 on the day) and mold my topic sentence to the question. However, I'm finding that for some of the questions, especially the more left-of-field ones, the paragraphs I've prepared don't really fit... Again, I don't understand how you could memorise quotes from the whole text and just spontaneously pick and choose on the day to create a perfect response, so do you have any tips for better preparing?
Hey lozil! Welcome to the forums!!

So I'm a little different in approach to Elyse and the other English mods, because I made up all my essays on the spot An on-the-spot piece can do just as well as a prepared piece (take this
20/20 exemplar I wrote in my CSSA, on the spot)!
I would prepare for these essays in two ways; First, I'd make quote sheets to memorise my ideas. Techniques, quotes and their impact on the audience. The effort I saved by not memorising, I invested here - I remembered about 30 quotes per module (my speeches module was significantly more). Think of it this way; Rather than memorising a battle plan, I just loaded up on a whole bunch of ammunition. I went Rambo on it, I suppose.
Besides that, the best thing is practice. Although I never memorised essays, I did develop my patterns and ideas by continually using them in practice exams (and getting these essays marked is really important as well). Practice makes perfect, and although practicing essays is not the best way to spend an afternoon, it's essential for being really prepared in the exam room

Would uploading the quote sheets I used be helpful for you? I reckon I could find them, you could see exactly what I prepared

let me know!